Зачем нужен такой SQL-запрос?

INSERT INTO oauth_server_token
				SET ost_osr_id_ref		= %d,
					ost_usa_id_ref		= 1,
					ost_token			= '%s',
					ost_token_secret	= '%s',
					ost_token_type		= 'request',
					ost_token_ttl       = DATE_ADD(NOW(), INTERVAL %d SECOND)
				ON DUPLICATE KEY UPDATE
					ost_osr_id_ref		= VALUES(ost_osr_id_ref),
					ost_usa_id_ref		= VALUES(ost_usa_id_ref),
					ost_token			= VALUES(ost_token),
					ost_token_secret	= VALUES(ost_token_secret),
					ost_token_type		= VALUES(ost_token_type),
					ost_token_ttl       = VALUES(ost_token_ttl),
					ost_timestamp		= NOW()